Screen for dry-pans.



D. R. KERNBR & F. U. PERRELL. SCREEN FOR DRY FANS.

APPLICATION FILED MAR. 19, 1914.

Patented Oct.6,1914.

2 SHEETS-SHEET 1.

D. R. KERNER & P G. FERRELL. SCREEN FOR DRY PANS.

APPLICATION FILED MAR.19, 1914.

1 y 1 3i 'flfio Patented Oct. 6, 1914 2 SHEETS-SHEET 2.

srnrns orrron.

DANIEL R. KERNER AND FBEDRICK C. FERRELL, 0F ZANESVILLE, OHIO.

SCREEN, FOB DRY-FANS.

Specification of Letters Patent.

Patented cm. 6, ieie'.

Application filed March 19, 191%. Serial No. 825,750.

To all "LU/207E it may concern:

Be it known that we; DANIEL R. KERNER and Fnnomon C. EERRELL citizens of the United States,'and residents of the city of Zanesville, county er Muskingum, and State of Ohio have invented-certain new and useful Improvements in Screens for Dry-Pans,

of which the following is a specification.

Our invention relates to dry pans of mills such as are used for disintegrating shale or like matcriaLa-nd more specifically to the screens which are used in pans of this chartional detail illustrating the engagement of actor.

The object of our invention is the production of a screen for a dry pan of the character mentioned which will be of durable and economical construction, one which will presenta maximum extent of screening surface, and one which will be efficient in use.

Other objects will appear hereinafter,

llfith these objects in view our invention consists in the combinations and arrangements of parts hereinafter described and claimed.

T he invention will be best understood by reference to the accompanying drawings forming a part of this specification. and in which- Figure l is a top plan view of a screen member embodying our invention, Fig. 2 is a bottom plan view thereof, Fig. is a perspective view of the frame of the-screen member. Fig. e: is a central vertical section through one of the screen members ar.

Fig, 1. Fig.6 is a perspective view of an end portion of one of the retaining bars included in the construction, Fig. 7 is a seethe pins of the reinforcing bars of the device with'the screening bars, and Fig. 8 is a detail perspective ofone of the screening bars detached.

The preferred form of construction as Formed in the frame 1 are openings 4, the opposite sides or ends of said framebe mg of similar construction and so that in the following, the description of one side of the screen will be applicable to the other side and therefore will 'sufiice for both. Arranged in the opening 4: is a plurality of spacedparallel screen bars 5 the ends of which are held in position from below by retaining bars 6 which are releasably secured to the frame 1 at opposite sidesof said openings by securing devices 7. The upper edges of retaining bars 6 are provided with recesses 8 adapted-to 'snugly'receive the ends of said screen bars and there by serve to retain said screen bars in spaced relation. At opposite sides of the opening i are provided the shouiders or engaging flanges 9 between which and the retaining bars 6 the ends of said screen bars are held.v Said endsof said screen bars are oflset' or cut away at 10 as clearly shown in Fig. 8 in order to accommodate the shoulders or flanges fl and permit of the upper edges of said screen bars extending flush with the upper side of the frame Each of the screen bars 5 -in cross section tapers downwardly, the upper portion of each barbeing but slightlyptapered or justisufiiciently to allow for clearance of the pulverized shale in the operation of the dry. pan, the lower portion of each bar being 'more acutely tapered as clearly shown in Figs. '5 and 7. The recesses 8 in the retaining bars 6 are, correspondingly formed as clearly shown in Fig. 6 so as to snugly receive the ends of said screen bars as will be readily understood.

Arranged below the screen bars 5, extending medially of the ends thereof, is a reinforcing bar 1.1 from which project upwardly a plurality of spaced pins 12. The upper ends of said pins 12 engage between the screen bars 5 serving to reinforce the same and to maintain the proper spacing thereof. Said upper ends of said pins 12are tapered, as clearly shown in Fig. 7, tofcorrespond with the taper of said screen bars,.said ends of said pins being wedged between said screen bars. The respective ends of thereinforcing bar 11 engage pockets 13 'Pro vided atthe under side ofitheframe 1 said ends of said bar being releasebly secured in position in said pockets by means of cleats 14 secured to said frame 1 by of securing devices Said securingdeviees nait of considerable wear of the screen before the upper ends of said securing devices ill be worn'away, thus serving to prolong the life of the screen. The respective ends of retaining bars 6 correspondingly engage 10 pockets 17 provided for the reception thereof at the under side of frame 1, the ends of the retaining bars at the center of said frame being engaged by the cleats 14: which aid in securing said bars in position. The cleats 1 1% do not extend outwardly sufliciently for to engage over the respective ends of the retaining bars at the ends or sidesofthe frame 1, terminating a short distance from the corresponding edges of said frame in 20 order to accommodate the spider arms 2 .of

y the dry pan, the latter therefore being adapted, when the device is in use, to cooperate with the retaining bars not engaged by the cleats 14 to aid in securing the same in operative position or to perform the same function as cleats 14; with reference to the inner retaining bars. The ends of said cleats, when the device is in use, also engage or interlock with the spider arms 2 so as to hold the screen member or segment against lateral movement.

By forming the screen bars with the upper portions thereof slightly tapered, as the top surface of the screen is worn away,

the screen bars can wear to nearly one-half of their thickness before the opening or spaces between said bars will increase appreciably in Width or to such an extent as to render the screen ineffective in the screento ing of material to a desired fineness. Thus the life of the screen is materially extended.

The various parts of the screen are detachably connected so that in the event of any part becoming disabled, the same may ,45 be readily removed and replaced.

The device is in the nature of an attachment, being separate and independent of the dry pan in which the same is loosely arranged after being assembled. This is of advantage in that the assembling of the parts of the screen segment may be more easily effected outside of the screen' than in the latter, Where the assembler would be confined and the various parts not so readily accessible.

While we have illustrated and described the preferred form of construction for carrying our invention into effect, this is capable of variation and modification without 30 departing from the spirit of our invention.

We, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail ourselves of such variations andmodifications as come within the scope of the appended claims.

1,112,eoe

Having described our invention what we claim as new and desire to secure by Letters Patent is:

1. A device of the class described comprising a frame having an opening therein; a plurality of spaced parallel screen bars traversing said opening; retaining bars secured to said frame having recesses adapted to receive the ends of said screen bars; pockets for the ends of said retaining bars provided in said frame; shoulders at opposite sides of said opening between which and said retaining bars the ends of said screen bars are held:- and cleatson said frame for releasably holding said ends of said retaining bars in said pockets, substantially as described.

2. A device of the class described comprising a. frame having an opening therein and recesses in its lower side adjacent said opening; shoulders on said frame extending into said opening; spaced parallel screen bars in said opening and having their ends extending under said shoulders; and retain ing bars Sllp )OIiIiD said screen bars and having their ends seemed in the recesses in said frame, substantially as described.

3. A device of the class described comprising a frame having an opening therein and recesses in its lower side adjacent said opening; shoulders on said frame extending into said opening; spaced parallel screen bars in said opening and having their ends extending under said shoulders? retaining bars supporting said. screen bars and having their ends secured in the recesses in said frame; cleats against the under side of said frame and supporting said retaining bars; and rivets securing said cleats to said frame, the heads of said rivets at the upper side of said frame being deeply countersunk in the latter, substantially as described.

4. A. device of the class described comprising a frame having an opening therein and recesses in its lower side adjacent said opening; shoulders on' said frame extending into said opening; spaced parallel screen bars in said opening and having their upper corners recessed and their end portions extending under said shoulders; spaced supporting bars under said screen bars and provided with. portions engaging the sides of said screcu bars. the ends of said supporting bars being disposed in said recesses; cleats under .flltl frame and locking the ends of said supporting bars in said recesses; and rivets securing said cleats to said frame, substantially as described.

A device of the class described comprising a frame having an opening therein; a plurality of spaced parallel screen bars traversing said opening; retaining bars secured to said frame having recesses adapted to receive. the ends of a id screen bars; pockets for the ends of said retaining bars provided in said frame; shoulders at the opposite sides of said opening between which and said retaining bars the ends of said.

screen bars are held; means on said frame for releasably holding .said ends of said retaining bars in said pockets; and securing devices for saidlast mentioned means passing through the latter and said frame, the

traversing said opening; retaining bars for said screen bars having recesses adapted to receive the ends of said bars; shoulders at opposite sides of said opening betweenwhich and said retaining bars the ends of said screen bars are held; means at the under side of said frame for releasably holding the ends of said 'reta-ining bars in operative position; and securing devices for said last mentioned holding meanspassing through the latter and said frame, the upper ends of said securing devices being deeply counter-sunk in said frame, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

DANIEL R. KERNER. FREDRICK C. FERRELL. Witnesses:

' C. S. SERUM,

H. G. WINE. 

